<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      div {
        display: flex;
        width: 600px;
        height: 400px;
        background-color: pink;
        /* flex布局中，默认的子元素是不换行的， 如果装不开，会缩小子元素的宽度，放到父元素里面
            flex-wrap:nowrap;是默认值,不换行
        */
        /* flex-wrap:nowrap; */  
        flex-wrap: wrap;
      }

      div span {
        width: 150px;
        height: 100px;
        background-color: purple;
        color: #fff;
        margin: 10px;
      }
    </style>
  </head>
  <body>
    <div>
      <span>1</span>
      <span>2</span>
      <span>3</span>
      <span>4</span>
      <span>5</span>
    </div>
  </body>
</html>
